Display device and manufacturing method thereof

Abstract

According to one embodiment, a display device includes a lower electrode, an organic layer, an upper electrode, an insulating layer, a color filter having a first surface which faces the insulating layer, and a second surface on a side opposite to the first surface, a first lens provided on the first surface immediately above the lower electrode, formed into a convex shape and covered with the insulating layer, and a second lens provided on the second surface immediately above the lower electrode and formed into a convex shape. The second lens comprises at least a first layer having a first refractive index and formed into a hemispherical shape, and a second layer having a second refractive index higher than the first refractive index and covering the first layer.

What is claimed is: 
     
         1 . A display device comprising:
 a substrate;   a lower electrode provided above the substrate;   an organic layer provided on the lower electrode and including a light emitting layer;   an upper electrode provided on the organic layer;   an insulating layer provided above the upper electrode;   a color filter having a first surface which faces the insulating layer, and a second surface on a side opposite to the first surface;   a first lens provided on the first surface immediately above the lower electrode, formed into a convex shape and covered with the insulating layer; and   a second lens provided on the second surface immediately above the lower electrode and formed into a convex shape, wherein   the second lens comprises at least a first layer having a first refractive index and formed into a hemispherical shape, and a second layer having a second refractive index higher than the first refractive index and covering the first layer.   
     
     
         2 . The display device of  claim 1 , wherein
 the second lens further comprises a third layer having a third refractive index higher than the second refractive index and covering the second layer.   
     
     
         3 . The display device of  claim 2 , wherein
 an outer edge of the first layer, an outer edge of the second layer and an outer edge of the third layer are formed concentrically in plan view.   
     
     
         4 . The display device of  claim 2 , wherein
 the first layer is formed of an organic material, and   each of the second layer and the third layer is formed of an inorganic material or an organic material.   
     
     
         5 . The display device of  claim 1 , wherein
 the second lens overlaps at least part of the first lens in plan view.   
     
     
         6 . The display device of  claim 1 , further comprising:
 a cap layer provided on the upper electrode; and   a sealing layer provided on the cap layer and formed of an inorganic material, wherein   the insulating layer is provided on the sealing layer and is formed of an organic material, and   the first lens is formed of an organic material having a refractive index higher than a refractive index of the insulating layer.   
     
     
         7 . The display device of  claim 1 , further comprising a rib which covers a peripheral portion of the lower electrode, wherein
 the first lens and the second lens are surrounded by the rib in plan view.   
     
     
         8 . The display device of  claim 7 , wherein
 first lenses and second lenses are surrounded by the rib in plan view, and   the number of the first lenses is equal to the number of the second lenses.   
     
     
         9 . The display device of  claim 7 , wherein
 first lenses and second lenses are surrounded by the rib in plan view, and   the number of the first lenses is different from the number of the second lenses.   
     
     
         10 . The display device of  claim 1 , further comprising a rib which covers a peripheral portion of the lower electrode, wherein
 first lenses are surrounded by the rib in plan view and overlap the single second lens.   
     
     
         11 . The display device of  claim 1 , further comprising a rib which covers a peripheral portion of the lower electrode, wherein
 second lenses are surrounded by the rib in plan view and overlap the single first lens.   
     
     
         12 . A manufacturing method of a display device, comprising:
 forming an insulating layer above a display element by using an organic material;   forming a patterned resist on the insulating layer;   forming a recess portion by removing part of the insulating layer using the resist as a mask;   forming a first lens with which the recess portion is filled;   forming a color filter on the first lens; and   forming a second lens having a convex shape on the color filter, wherein   the forming the second lens includes at least:
 forming a hemispherical first layer by using a material having a first refractive index; and 
 forming a second layer which covers the first layer by using a material having a second refractive index higher than the first refractive index. 
   
     
     
         13 . The manufacturing method of  claim 12 , wherein
 the forming the second lens further includes forming a third layer which covers the second layer by using a material having a third refractive index higher than the second refractive index.   
     
     
         14 . The manufacturing method of  claim 13 , wherein
 the first layer is formed of an organic material, and   each of the second layer and the third layer is formed of an inorganic material or an organic material.   
     
     
         15 . The manufacturing method of  claim 12 , wherein
 the first lens is formed of an organic material having a refractive index higher than a refractive index of the insulating layer.